condition mean min max ZT0-3 10.0165775495 9.116028939 10.91712616 ZT4-7 4.37115207875 4.279793949 4.4625102084999995 ZT8-11 4.39641931775 3.7797483225 5.013090313 ZT12-15 8.155541069249999 6.950123305 9.3609588335 ZT16-19 12.331838289250001 9.400276233500001 15.263400345 ZT20-23 29.3825822425 24.193262474999997 34.57190201